<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box1 {
            outline: none;
        }
        .box3 {
            resize: none;
        }
        .box4 {
            outline: none;
        }
    </style>
</head>
<body>
    <!-- 取消了轮廓线 -->
    <input class="box1" type="text">
    <!-- 没取消轮廓线 -->
    <input class="box2" type="text">
    <!-- 取消拖拽  没取消轮廓线-->
    <textarea class="box3" name="" id="" cols="30" rows="10"></textarea>
    <!-- 没有取消拖拽  取消轮廓线-->
    <textarea class="box4" name="" id="" cols="30" rows="10"></textarea>
</body>
</html>